[Python] ZeroMQ 'Restart' if no reply was recieved

I have a python program which sends height data from my client to my server program. My server program will not be always running so if I don't recieve a response I would like it to try again.

So far what I have is that if a response (from the server) is not given in 20 Seconds it causes an exception and recalls my input. It works fine until I try it a second time.

Here is my code:

import zmq
from time import sleep

global radius
context = zmq.Context()
print("Remote Deployment Application")
print("Lightweight ZMQ Communication")
print("Connecting to Desk Ctrl Service")
socket = context.socket(zmq.REQ)
socket.connect("tcp://192.168.1.9:5555")
socket.setsockopt(zmq.RCVTIMEO, 30000)
socket.setsockopt(zmq.LINGER, 0)


# Do 10 requests,waiting each time for a response
def __init__(self, height):
self.height = height

def start():
global height
height = input("Enter in request: ")
SendHeightVal()


def SendHeightVal():
global userinput
global height
print("Sent Request. Awaiting Reply.")
so_bytes = height.encode()
socket.send(so_bytes)
so_bytes = 0
try:
message = socket.recv()
except:
print("Something went wrong. No response from server!")
message = None
start()
print(message)
start()


Here is the error:

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
File "client.py", line 44, in <module>
start()
File "client.py", line 22, in start
SendHeightVal()
File "client.py", line 37, in SendHeightVal
start()
File "client.py", line 22, in start
SendHeightVal()
File "client.py", line 30, in SendHeightVal
socket.send(so_bytes)
File "/usr/local/lib/python3.6/site-packages/zmq/sugar/socket.py", line 391, in send
return super(Socket, self).send(data, flags=flags, copy=copy, track=track)
File "zmq/backend/cython/socket.pyx", line 727, in zmq.backend.cython.socket.Socket.send
File "zmq/backend/cython/socket.pyx", line 774, in zmq.backend.cython.socket.Socket.send
File "zmq/backend/cython/socket.pyx", line 249, in zmq.backend.cython.socket._send_copy
File "zmq/backend/cython/socket.pyx", line 244, in zmq.backend.cython.socket._send_copy
File "zmq/backend/cython/checkrc.pxd", line 25, in zmq.backend.cython.checkrc._check_rc
zmq.error.ZMQError: Operation cannot be accomplished in current state

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